The 3D View Properties window controls the view of the active 3D window. The active 3D window is the most recently selected 3D window. The Title of the active window will be blue while the inactive window titles will be grey. In 3D ribbon>Display Settings you can also set different colors for active (Selected) vs inactive (Other Views) 3D windows.
3D View Properties is divided into the following tabs:
Right click over the tabs to access the context menu and uncheck any tabs you wish to hide.
Tabs can also be reordered by left clicking the tab and using drag and drop to the new location.
The 3D View Properties window can be displayed in a vertical or horizontal layout. By default it opens on the right side of the screen (docked with the other Properties windows) in a vertical layout. Undock the window and drag and drop to the bottom of the application using the Smart Placement icons and the window will be reconfigured for a horizontal layout. When resizing the window, horizontal layout will be used when the width is greater than the height. In horizontal layout the tab names are visible, while in vertical layout they are not - in vertical layout, hover over the tab icon to see the tab name.